Houtaro actually missed his sister and wanted to spend the time with her without telling a soul, but seriously, I'm gonna need a higher version of 11.5, that webrip is just disasterribad.
Anyways, Houtarou should have complimented Chitanda when they were alone then that she looked nice in that swimsuit, although it barely looks like anything with this quality, but I think him complimenting someone would be too obvious, then again, Chitanda would keep it to herself.
As for Ep12
Damn that was amazing, Chitanda in a real pinch hahahahah

And Oreki's smile, damn.
New ED is great

I think next week there will be a new OP then.